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This pocket-sized paperback concisely covers each objective on Cisco's Certified Network Associate (CCNA) Exam 640-407. With brief paragraphs and numbered lists, it itemizes key concepts and ...
This pocket-sized paperback concisely covers each objective on Cisco's Certified Network Associate (CCNA) Exam 640-407. With brief paragraphs and numbered lists, it itemizes key concepts and functions. It also includes test-taking tips and configuration instructions.
People in the networking industry tend to use a lot of acronyms and other lingo to describe basic things. The parts of ISDN are no exception. In this section, we define some of these terms and the features they describe.
The components we describe are really the nuts and bolts of ISDN, which are very important for you to understand both when you are setting up an ISDN connection and studying for the CCNA exam.
This section focuses on ISDN and how Cisco views its protocols, function groups, reference points, and channels.
ISDN protocols are defined by the ITU-T. Here are three diverse ISDN protocols whose function is specified by their first letter:
Function groups connecting to the ISDN network are known as terminals. These come in two types:
ISDN Reference Points
ISDN uses four different reference points to define logical interfaces between functional groupings such as TAs and NT1s. They are as follows:
There are two types of channels used in BRI ISDN: B and D. Here's what each one does:
NOTE To learn more about ISDN and channels, read the Sybex Advanced Cisco Router Configuration (ACRC) Study Guide.
To pass this portion of the exam, you'll need to remember the terminology used for ISDN features, as well as how the various parts function.
Understand the different protocols used in ISDN. The Q protocol specifies switching and signaling. E protocols apply to ISDN on an existing telephone network. I protocols deal with concepts, terminology, and services.
Know the difference between a B channel and a D channel. A BRI uses 2 B channels and one D channel. Each B channel is 64Kbps; a D channel is 16Kbps.
BRI: Basic Rate Interface (BRI) is an ISDN interface composed of two B channels and one D channel for circuit-switched communication of voice, video, and data.
ISDN: A digital communication protocol that permits telephone networks to carry data and voice transmissions at higher speeds than typical analog transmission rates.
ITU-T: International Telecommunication Union Telecommunication Standardization Sector. This group creates international standards for internetworks and telecommunications.
OSI: An acronym for Open Systems Interconnection, OSI was created by the International Organization for Standardization (ISO) to create a layered approach to interoperability between disparate systems.
Reference Point: Used to define logical interfaces in ISDN.
1. What does an R reference point define?
2. When protocols begin with the letter Q, what does that specify?
|Ch. 1||OSI Reference||1|
|Ch. 2||WAN Protocols||37|
|Ch. 4||Network Protocols||147|
|Ch. 6||Network Security||251|
|Ch. 7||LAN Switching||267|
Posted June 14, 2001
The Sybex CCNA Study Guide + Exam Notes were a great combination for me. I *read* the Study Guide and *studied* the Exam Notes and was able to pass the CCNA test with a minimal amount of preparation time.Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.
Posted September 7, 2000
Posted July 4, 2000
I used this book to pass my CCNA exam in the first shot. Keep in mind this book highlights key points of the exam material, if you do not have a good understanding of WAN Protocols such as ISDN, Frame Relay and ATM, this book, alone, probably is not enough to get by on. If that is the case, I suggest you purchase the Study Guide. Todd Lammle's layout of the information is well organized and easy to follow.Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.
Posted April 3, 2000
If you study this book and understand the concepts presented you will pass. Materials are presented in a concise, easy to follow manner. A must for CCNA candidates.Was this review helpful? Yes NoThank you for your feedback. Report this reviewThank you, this review has been flagged.